﻿#region license
// Copyright (c) 2003, 2004, 2005 Rodrigo B. de Oliveira (rbo@acm.org)
// All rights reserved.
// 
// Redistribution and use in source and binary forms, with or without modification,
// are permitted provided that the following conditions are met:
// 
//     * Redistributions of source code must retain the above copyright notice,
//     this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above copyright notice,
//     this list of conditions and the following disclaimer in the documentation
//     and/or other materials provided with the distribution.
//     * Neither the name of Rodrigo B. de Oliveira nor the names of its
//     contributors may be used to endorse or promote products derived from this
//     software without specific prior written permission.
// 
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
// THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#endregion


using System;
using Milo.Ast;

namespace Milo.Compilation.Steps
{
	public class ContextAnnotations
	{		
		static object EntryPointKey = new object();
		
		static object AssemblyBuilderKey = new object();

		public static Method GetEntryPoint(CompilerContext context)
		{
			if (null == context)
			{
				throw new ArgumentNullException("context");
			}
			return (Method)context.Properties[EntryPointKey];
		}
		
		public static void SetEntryPoint(CompilerContext context, Method method)
		{
			if (null == method)
			{
				throw new ArgumentNullException("method");
			}
			
			Method current = GetEntryPoint(context);
			if (null != current)
			{
				throw CompilerErrorFactory.MoreThanOneEntryPoint(method);
			}
			context.Properties[EntryPointKey] = method;
		}
		
		public static System.Reflection.Emit.AssemblyBuilder GetAssemblyBuilder(CompilerContext context)
		{
			System.Reflection.Emit.AssemblyBuilder builder = (System.Reflection.Emit.AssemblyBuilder)context.Properties[AssemblyBuilderKey];
			if (null == builder)
			{
				throw CompilerErrorFactory.InvalidAssemblySetUp(context.CompileUnit);
			}
			return builder;
		}
		
		public static void SetAssemblyBuilder(CompilerContext context, System.Reflection.Emit.AssemblyBuilder builder)
		{
			if (null == context)
			{
				throw new ArgumentNullException("context");
			}
			if (null == builder)
			{
				throw new ArgumentNullException("builder");
			}
			context.Properties[AssemblyBuilderKey] = builder;
		}

		private ContextAnnotations()
		{
		}
	}
}